The condensation reaction between hydroxyl terminated polybutadiene and an uritonimine modified 4, 4' diphenylmethane diisocyanate (liquid MDI) was carried out by reactive extrusion in the presence of gamma propyl trietoxy amino silane treated glass-beads and polystyrene. Reactants were selected having a surface tension favoring the glass bead coating using the spreading coefficient concept. FTIR, SEC (size exclusion chromatography) and rheological analysis of the resultant material showed that condensation reaction had occurred leading to crosslinked Polyurethane located principally around the glass beads.